Hook size
7 mm crochet hook
A 7 mm crochet hook has no standard US letter size and has old UK size 2. It is the recommended hook range for bulky (5) yarn, and crocheters typically choose it for bulky scarves, chunky hats and quick cozy throws. Always check gauge with a swatch, because tension varies between crocheters.
By the crochetpatterns.io editorial team · Updated · Editorial policy
| Metric | US | Old UK | Suits yarn weights |
|---|---|---|---|
| 7 mm | — | 2 | #5 Bulky |
What is a 7 mm crochet hook in US and UK sizes?
A 7 mm hook is not given a standard US letter size and old UK size 2. Metric millimetres are the only measurement that is the same on every brand, so check the mm size stamped on the hook.
| Metric | US | Old UK | Yarn weights |
|---|---|---|---|
| 6 mm | J-10 | 4 | #4 |
| 6.5 mm | K-10½ | 3 | #4, #5 |
| 7 mm (this hook) | — | 2 | #5 |
| 8 mm | L-11 | 0 | #5 |
| 9 mm | M/N-13 | 00 | #5, #6 |
What yarn weight goes with a 7 mm hook?
A 7 mm hook is typically used with bulky (#5) yarn. Bulky yarn gives about 8–11 sc per 4 in / 10 cm and suits chunky hats, scarves and cowls, quick throws.
| Weight | Also called | Crochet gauge | Recommended hooks |
|---|---|---|---|
| #5 Bulky | Chunky, Craft, Rug, 12-ply (AU/NZ) | 8–11 sc per 4 in / 10 cm | 6.5–9 mm |
What can you make with a 7 mm hook?
1 pattern in our library use a 7 mm hook, including star-stitch crochet shawl (1911).
Sources and scope
- Craft Yarn Council: Hooks & Needles
Reference for metric and US hook sizes. Letter and number labels vary between manufacturers; check the millimetre measurement. Old UK sizes are a separate historical convention.
- Craft Yarn Council: Standard Yarn Weight System
Source for categories 0–7 and the crochet gauge and hook ranges. These are starting guidelines; use the gauge in your pattern. Regional ply names and yards per 100 g are approximate comparisons, not CYC specifications.
